US20210098714A1 - Organic electroluminescence device - Google Patents

Organic electroluminescence device Download PDF

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US20210098714A1
US20210098714A1 US16/906,991 US202016906991A US2021098714A1 US 20210098714 A1 US20210098714 A1 US 20210098714A1 US 202016906991 A US202016906991 A US 202016906991A US 2021098714 A1 US2021098714 A1 US 2021098714A1
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substituted
dopant
carbon atoms
ring
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Minsoo CHOI
Minje Kim
Eung Do Kim
Hyunyoung Kim
Hyojeong KIM
Hyosup Shin
Seokgyu Yoon
Youngki Lee
Jungsub LEE
Jiyoung Lee
Hyejin Jung
Kunwook CHO
Hyeon Gu Cho
Youngeun Choi
Jaejin LYU
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Samsung Display Co Ltd
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Samsung Display Co Ltd
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Assigned to SAMSUNG DISPLAY CO., LTD. reassignment SAMSUNG DISPLAY CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CHO, HYEON GU, CHO, Kunwook, CHOI, MINSOO, CHOI, Youngeun, JUNG, HYEJIN, KIM, EUNG DO, KIM, HYOJEONG, KIM, HYUNYOUNG, KIM, MINJE, LEE, JIYOUNG, LEE, JUNGSUB, LEE, YOUNGKI, LYU, JAEJIN, SHIN, HYOSUP, YOON, SEOKGYU
Priority to US17/131,555 priority Critical patent/US20210119168A1/en
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Definitions

  • One or more aspects of embodiments of the present disclosure relate to an organic electroluminescence device, and more particularly, to an organic electroluminescence device including a plurality of light-emitting materials in an emission layer.
  • Organic electroluminescence displays are being actively developed as image displays.
  • An organic electroluminescence display differs from a liquid crystal display in that it is a so-called a self-luminescent display, in which holes and electrons respectively injected from a first electrode and a second electrode recombine in an emission layer, and a light-emitting material including an organic compound in the emission layer emits light to attain display.
  • One or more aspects of embodiments of the present disclosure are directed toward an organic electroluminescence device showing excellent lifespan (lifetime) characteristics and emission efficiency.
  • One or more example embodiments of the present disclosure provide an organic electroluminescence device including a first electrode, a second electrode opposite the first electrode, and an emission layer disposed between the first electrode and the second electrode.
  • the emission layer includes a host having a first luminescent onset wavelength, a first dopant having a second luminescent onset wavelength, and a second dopant different from the first dopant and having a third luminescent onset wavelength.
  • the third luminescent onset wavelength is greater than the first luminescent onset wavelength and the second luminescent onset wavelength.
  • a normalized light intensity at a cross point of a normalized light absorption spectrum and a normalized light emission spectrum of the second dopant may be about 0.5 or more.
  • a distance between a peak of the normalized light absorption spectrum and a peak of the normalized light emission spectrum of the second dopant may be about 50 nm or less.
  • the second dopant may have a smaller (e.g., may be smaller in) lowest triplet excitation energy level than each of the host and the first dopant.
  • the host may include a first host and a second host, the second host being different from the first host.
  • the first host may be represented by Formula H-1:
  • L 1 may be a direct linkage, a substituted or unsubstituted arylene group of 6 to 30 carbon atoms for forming a ring, or a substituted or unsubstituted heteroarylene group of 2 to 30 carbon atoms for forming a ring;
  • Ar 1 may be a substituted or unsubstituted aryl group of 6 to 30 carbon atoms for forming a ring, or a substituted or unsubstituted heteroaryl group of 2 to 30 carbon atoms for forming a ring;
  • “a” and “b” may each independently be an integer of 0 to 4; and
  • R 1 and R 2 may each independently be a substituted or unsubstituted aryl group of 6 to 30 carbon atoms for forming a ring, or a substituted or unsubstituted heteroaryl group of 2 to 30 carbon atoms for forming a ring.
  • the second host may be represented by Formula H-2:
  • Z 1 to Z 3 may each independently be CR y or N; and R y and R 11 to R 13 may each independently be a hydrogen atom, a deuterium atom, a cyano group, a substituted or unsubstituted silyl group, a substituted or unsubstituted aryl group of 6 to 30 carbon atoms for forming a ring, or a substituted or unsubstituted heteroaryl group of 2 to 30 carbon atoms for forming a ring.
  • the first dopant may include an organometallic complex including iridium (Ir), ruthenium (Ru), rhodium (Rh), platinum (Pt), palladium (Pd), copper (Cu), or osmium (Os) as a central metal element.
  • organometallic complex including iridium (Ir), ruthenium (Ru), rhodium (Rh), platinum (Pt), palladium (Pd), copper (Cu), or osmium (Os) as a central metal element.
  • the first dopant may be represented by Formula D-1:
  • M may be Pt, Pd, Cu, Os, Ir, Ru, or Rh;
  • Q 1 to Q 4 may each independently be C or N;
  • C1 to C4 may each independently be a substituted or unsubstituted hydrocarbon ring of 5 to 30 carbon atoms for forming a ring, or a substituted or unsubstituted heterocycle of 2 to 30 carbon atoms for forming a ring;
  • L 21 to L 23 may each independently be a direct linkage, *—O—*, *—S—*,
  • R 21 to R 26 may each independently be a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a substituted or unsubstituted amine group, a substituted or unsubstituted alkyl group of 1 to 20 carbon atoms, a substituted or unsubstituted aryl group of 6 to 30 carbon atoms for forming a ring, or a substituted or unsubstituted heteroaryl group of 1 to 30 carbon atoms for forming a ring, or may be combined with an adjacent group to form
  • the second dopant may be represented by Formula D-2a:
  • X 1 and X 2 may each independently be NR m or O;
  • R m may be a hydrogen atom, a deuterium atom, a substituted or unsubstituted alkyl group of 1 to 20 carbon atoms, a substituted or unsubstituted aryl group of 6 to 30 carbon atoms for forming a ring, or a substituted or unsubstituted heteroaryl group of 2 to 30 carbon atoms for forming a ring;
  • R 31 to R 41 may each independently be a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a substituted or unsubstituted amine group, a substituted or unsubstituted boryl group, a substituted or unsubstituted oxy group, a substituted or unsubstituted alkyl group of 1 to 20 carbon atoms, a substituted or unsubstituted aryl group of
  • the second dopant may be represented by Formula D-2b:
  • L 2 may be a direct linkage, a substituted or unsubstituted arylene group of 6 to 30 carbon atoms for forming a ring, or a substituted or unsubstituted heteroarylene group of 2 to 30 carbon atoms for forming a ring; and D 1 may be represented by Formula D-2-1 or Formula D-2-2:
  • L3 and L4 may each independently be a direct linkage, or a substituted or unsubstituted arylene group of 6 to 30 carbon atoms for forming a ring;
  • R 42 to R 59 may each independently be a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted silyl group, a substituted or unsubstituted alkyl group of 1 to 15 carbon atoms, a substituted or unsubstituted aryl group of 6 to 30 carbon atoms for forming a ring, or a substituted or unsubstituted heteroaryl group of 2 to 30 carbon atoms for forming a ring;
  • Y 1 may be a direct linkage, CR a R b , SiR c R d , GeR e R f , NR g , O or S;
  • R a to R g may each independently be a substituted or unsub
  • Y 2 may be C ⁇ O or S( ⁇ O) 2 ;
  • Y 3 may be C ⁇ O, or O;
  • Y 4 and Y 5 may each independently be O or S;
  • Y 6 and Y 7 may each independently be N or CQ 12 ,
  • Y 8 may be O or NQ 13 ;
  • Q 1 to Q 13 may each independently be a substituted or unsubstituted alkyl group of 1 to 15 carbon atoms, a substituted or unsubstituted aryl group of 6 to 30 carbon atoms for forming a ring, or a substituted or unsubstituted heteroaryl group of 2 to 30 carbon atoms for forming a ring;
  • n1, n4, and n6 may each independently be 0 to 4;
  • n10 may each independently be an integer of 0 to 3;
  • n2 may bean integer of 0 to 5; and
  • n9 may
  • the first host and the second host may be in a weight ratio of about 7:3 to about 3:7.
  • an amount of the first dopant may be about 10 wt % to about 15 wt %
  • an amount of the second dopant may be about 1 wt % to about 5 wt % based on a total weight of the first host, the second host, the first dopant, and the second dopant.
  • One or more example embodiments of the present disclosure provide an organic electroluminescence device including a first electrode, a second electrode on the first electrode, and an emission layer between the first electrode and the second electrode.
  • the emission layer includes a first host, a second host that is different from the first host, a first dopant having a second onset wavelength, and a second dopant different from the first dopant and having a third onset wavelength.
  • the third onset wavelength may be greater than the second onset wavelength, and a normalized light intensity at a cross point of a normalized light absorption spectrum and a normalized light emission spectrum of the second dopant may be about 0.5 or more.
  • an organic electroluminescence device including a first electrode, a second electrode on the first electrode, and an emission layer between the first electrode and the second electrode.
  • the emission layer includes a first host including a hole transport moiety, a second host different from the first host and including an electron transport moiety, a first dopant having a second onset wavelength and including an organometallic complex including Ir, Ru, Rh, Pt, Pd, Cu, or Os as a central metal element, and a second dopant having a third onset wavelength and being a delayed fluorescence emitting body.
  • the third onset wavelength may be greater than the second onset wavelength.
  • FIG. 1 is a cross-sectional view schematically illustrating an organic electroluminescence device according to an embodiment of the present disclosure
  • FIG. 2 is a cross-sectional view schematically illustrating an organic electroluminescence device according to an embodiment of the present disclosure
  • FIG. 3 is a cross-sectional view schematically illustrating an organic electroluminescence device according to an embodiment of the present disclosure
  • FIG. 4 is a cross-sectional view schematically illustrating an organic electroluminescence device according to an embodiment of the present disclosure
  • FIG. 5 is a cross-sectional view schematically illustrating an organic electroluminescence device according to an embodiment of the present disclosure
  • FIG. 6A to FIG. 6F are plots of the normalized emission spectra (intensity vs. wavelength) of a host, a first dopant and a second dopant according to example embodiments of the present disclosure.
  • FIG. 7A and FIG. 7B are plots of the light emission spectrum and light absorption spectrum (intensity vs. wavelength) of the second dopant according to an embodiment of the present disclosure.
  • FIG. 1 to FIG. 5 are schematic cross-sectional views of organic electroluminescence devices according to example embodiments of the present disclosure.
  • a first electrode EL 1 and a second electrode EL 2 are oppositely disposed, and an emission layer EML may be disposed between the first electrode EL 1 and the second electrode EL 2 .
  • the organic electroluminescence device 10 of an embodiment may further include a plurality of functional layers between the first electrode EL 1 and the second electrode EL 2 , in addition to the emission layer EML.
  • the plurality of the functional layers may include a hole transport region HTR and an electron transport region ETR.
  • the organic electroluminescence device 10 according to an embodiment may include a first electrode EL 1 , a hole transport region HTR, an emission layer EML, an electron transport region ETR, and a second electrode EL 2 , stacked in this stated order.
  • the organic electroluminescence device 10 of an embodiment may include a capping layer CPL disposed on the second electrode EL 2 .
  • the organic electroluminescence device 10 of an embodiment may include a compound of an embodiment, which will be explained later, in the emission layer EML disposed between the first electrode EL 1 and the second electrode EL 2 .
  • an embodiment of the present disclosure is not limited thereto, and in some embodiments the organic electroluminescence device 10 of an embodiment may include a compound of an embodiment, which will be explained later, in the hole transport region HTR or the electron transport region ETR (which are included in the plurality of the functional layers disposed between the first electrode EL 1 and the second electrode EL 2 , in addition to the emission layer EML), or in the capping layer CPL disposed on the second electrode.
  • FIG. 2 shows a cross-sectional view of an organic electroluminescence device 10 of an embodiment in which the hole transport region HTR includes a hole injection layer HIL and a hole transport layer HTL, and the electron transport region ETR includes an electron injection layer EIL and an electron transport layer ETL.
  • FIG. 3 shows a cross-sectional view of an organic electroluminescence device 10 of an embodiment in which the hole transport region HTR includes the hole injection layer HIL, the hole transport layer HTL, and an electron blocking layer EBL, and the electron transport region ETR includes the electron injection layer EIL, the electron transport layer ETL, and a hole blocking layer HBL.
  • FIG. 1 shows a cross-sectional view of an organic electroluminescence device 10 of an embodiment in which the hole transport region HTR includes the hole injection layer HIL, the hole transport layer HTL, and an electron blocking layer EBL, and the electron transport region ETR includes the electron injection layer EIL, the electron transport layer ETL, and a hole blocking layer HBL.
  • FIG. 4 shows a cross-sectional view of an organic electroluminescence device 10 of an embodiment including a buffer layer BFL between the emission layer EML and the electron transport region ETR.
  • FIG. 5 shows a cross-sectional view of an organic electroluminescence device 10 of an embodiment including a capping layer CPL disposed on a second electrode EL 2 .
  • the first electrode EL 1 has conductivity (e.g., may be conductive).
  • the first electrode EL 1 may be formed using a metal alloy or a conductive compound.
  • the first electrode EL 1 may be an anode.
  • the first electrode EU may be a pixel electrode.
  • the first electrode EL 1 may be a transmissive electrode, a transflective electrode, or a reflective electrode. If the first electrode EU is a transmissive electrode, the first electrode EL 1 may include a transparent metal oxide (such as indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), and/or indium tin zinc oxide (ITZO)).
  • ITO indium tin oxide
  • IZO indium zinc oxide
  • ZnO zinc oxide
  • ITZO indium tin zinc oxide
  • the first electrode EU may include silver (Ag), magnesium (Mg), copper (Cu), aluminum (Al), platinum (Pt), palladium (Pd), gold (Au), nickel (Ni), neodymium (Nd), iridium (Ir), chromium (Cr), lithium (Li), calcium (Ca), LiF/Ca, LiF/AI, molybdenum (Mo), titanium (Ti), a compound thereof, or a mixture thereof (for example, a mixture of Ag and Mg).
  • the first electrode EU may have a structure including a plurality of layers including a reflective layer or a transflective layer formed using the above materials, and a transmissive conductive layer formed using ITO, IZO, ZnO, or ITZO.
  • the first electrode EL 1 may include a three-layer structure of ITO/Ag/ITO.
  • the thickness of the first electrode EL 1 may be about 1 , 000 A to about 10,000 ⁇ , for example, about 1,000 ⁇ to about 3,000 ⁇ .
  • the hole transport region HTR is provided on the first electrode EL 1 .
  • the hole transport region HTR may include at least one of a hole injection layer HIL, a hole transport layer HTL, a hole buffer layer, or an electron blocking layer EBL.
  • the thickness of the hole transport region HTR may be about 50 ⁇ to about 1,500 ⁇ .
  • the hole transport region HTR may have a single layer formed using a single material, a single layer formed using a plurality of different materials, or a multilayer structure including a plurality of layers formed using a plurality of different materials.
  • the hole transport region HTR may have a single layer structure including a hole injection layer HIL or a hole transport layer HTL, or may have a single layer structure including a hole injection material and a hole transport material (e.g., simultaneously or as a mixture).
  • the hole transport region HTR may have a structure of a plurality of layers formed using a plurality of different materials, such as a structure including a hole injection layer HIL/hole transport layer HTL, a hole injection layer HIL/hole transport layer HTL/hole buffer layer, a hole injection layer HIL/hole buffer layer, a hole transport layer HTL/hole buffer layer, or a hole injection layer HIL/hole transport layer HTL/electron blocking layer EBL, without limitation, each being stacked on the first electrode EL 1 .
  • the hole transport region HTR may be formed using various suitable methods (such as a vacuum deposition method, a spin coating method, a cast method, a Langmuir-Blodgett (LB) method, an inkjet printing method, a laser printing method, and/or a laser induced thermal imaging (LITI) method).
  • suitable methods such as a vacuum deposition method, a spin coating method, a cast method, a Langmuir-Blodgett (LB) method, an inkjet printing method, a laser printing method, and/or a laser induced thermal imaging (LITI) method).
  • the hole injection layer HIL may include, for example, a phthalocyanine compound such as copper phthalocyanine, N,N′-diphenyl-N,N′-bis-[4-(phenyl-m-tolyl-amino)-phenyl]-phenyl-4,4′-diamine (DNTPD), 4,4′,4′′-[tris(3-methylphenyl)phenylamino] triphenylamine (m-MTDATA), 4,4′,4′′-tris(N,N-diphenylamino)triphenylamine (TDATA), 4,4′,4′′-tris ⁇ N,-2-naphthyl)-N-phenylamino ⁇ -triphenylamine (2-TNATA), poly(3,4-ethylenedioxythiophene)/poly(4-styrenesulfonate) (PEDOT/PSS), polyaniline/dodecylbenzenesulfonic acid (PANI/DBSA
  • the hole transport layer HTL may include, for example, carbazole derivatives such as N-phenyl carbazole and polyvinyl carbazole, fluorine-based derivatives, N,N′-bis(3-methylphenyl)-N,N′-diphenyl-[1,1-biphenyl]-4,4′-diamine (TPD), triphenylamine-based derivatives such as 4,4′,4′′-tris(N-carbazolyl)triphenylamine (TCTA), N,N′-di(1-naphthalene-1-yl)-N,N′-diphenyl-benzidine (NPB), 4,4′-cyclohexylidene bis[N,N-bis(4-methylphenyl)benzeneamine (TAPC), 4,4′-bis[N,N′-(3-tolyl)amino]-3,3′-dimethylbiphenyl (HMTPD), 1,3-bis(N-carbazolyl)
  • the thickness of the hole transport region HTR may be about 50 ⁇ to about 10,000 ⁇ , for example, about 100 ⁇ to about 5,000 ⁇ .
  • the thickness of the hole injection region HIL may be, for example, about 30 ⁇ to about 1,000 ⁇ , and the thickness of the hole transport layer HTL may be about 30 ⁇ to about 1,000 ⁇ .
  • the thickness of the electron blocking layer EBL may be about 10 ⁇ to about 1,000 ⁇ . If the thicknesses of the hole transport region HTR, the hole injection layer HIL, the hole transport layer HTL and the electron blocking layer EBL satisfy the above-described ranges, satisfactory hole transport properties may be achieved without a substantial increase in driving voltage.
  • the hole transport region HTR may further include a charge generating material in addition to the above-described materials to increase conductivity.
  • the charge generating material may be dispersed substantially uniformly or non-uniformly in the hole transport region HTR.
  • the charge generating material may be, for example, a p-dopant.
  • the p-dopant may be a quinone derivative, a metal oxide, or a cyano group-containing compound, without limitation.
  • non-limiting examples of the p-dopant include quinone derivatives (such as tetracyanoquinodimethane (TCNQ) and/or 2,3,5,6-tetrafluoro-7,7′,8,8′-tetracyanoquinodimethane (F4-TCNQ)), metal oxides (such as tungsten oxide and/or molybdenum oxide), and inorganic metal compounds (such as CuI and/or RbI), without limitation.
  • quinone derivatives such as tetracyanoquinodimethane (TCNQ) and/or 2,3,5,6-tetrafluoro-7,7′,8,8′-tetracyanoquinodimethane (F4-TCNQ)
  • metal oxides such as tungsten oxide and/or molybdenum oxide
  • inorganic metal compounds such as CuI and/or RbI
  • the hole transport region HTR may further include at least one of a hole buffer layer or an electron blocking layer EBL in addition to the hole injection layer HIL and the hole transport layer HTL.
  • the hole buffer layer may compensate for an optical resonance distance according to the wavelength of light emitted from the emission layer EML, and may thereby increase light emission efficiency.
  • the hole transport region HTR and the hole buffer layer may include the same materials.
  • the electron blocking layer EBL may prevent or reduce electron injection from the electron transport region ETR to the hole transport region HTR.
  • the emission layer EML is provided on the hole transport region HTR.
  • the emission layer EML may have a thickness of, for example, about 100 ⁇ to about 1,000 ⁇ or about 100 ⁇ to about 300 ⁇ .
  • the emission layer EML may have a single layer formed using a single material, a single layer formed using a plurality of different materials, or a multilayer structure having a plurality of layers formed using a plurality of different materials.
  • the emission layer EML may include a plurality of different kinds (e.g., classes) of light-emitting materials.
  • the organic electroluminescence device 10 of an embodiment may include a first host and a second host, which are different from each other, and a first dopant and a second dopant, which are different from each other.
  • substituted or unsubstituted refers to a state of being substituted, or unsubstituted with at least one substituent selected from the group consisting of a deuterium atom, a halogen atom, a cyano group, a nitro group, an amino group, a silyl group, an oxy group, a thio group, a sulfinyl group, a sulfonyl group, a carbonyl group, a boron group, a phosphine oxide group, a phosphine sulfide group, an alkyl group, an alkenyl group, an alkoxy group, a hydrocarbon ring group, an aryl group, and a heterocyclic group.
  • substituent selected from the group consisting of a deuterium atom, a halogen atom, a cyano group, a nitro group, an amino group, a silyl group, an oxy group, a thio
  • Each of the exemplified substituents may be further substituted or unsubstituted.
  • a biphenyl group may be interpreted as a named aryl group, or in some embodiments may be interpreted as a phenyl group substituted with a phenyl group.
  • the term “forming a ring via the combination with an adjacent group” may refer to forming a substituted or unsubstituted hydrocarbon ring or heterocycle by combining with an adjacent group.
  • hydrocarbon ring includes an aliphatic hydrocarbon ring and an aromatic hydrocarbon ring.
  • heterocycle includes an aliphatic heterocycle and an aromatic heterocycle.
  • the ring formed by combining with an adjacent group may be a monocyclic ring or a polycyclic ring.
  • the ring formed via combining with an adjacent group may be further combined with another ring to form a spiro structure.
  • adjacent group may refer to a substituent on an adjacently bonded atom, a substituent on the same atom, or a substituent sterically positioned at the nearest position to (e.g., within bonding distance of) a corresponding substituent.
  • the two methyl groups may be interpreted as “adjacent groups” to each other, and in 1,1-diethylcyclopentene, the two ethyl groups may be interpreted as “adjacent groups” to each other.
  • non-limiting examples of the halogen atom include a fluorine atom, a chlorine atom, a bromine atom or an iodine atom.
  • alkyl group may refer to a linear, branched or cyclic alkyl.
  • the number of carbons in the alkyl group may be 1 to 50, 1 to 30, 1 to 20, 1 to 10, or 1 to 6.
  • Non-limiting examples of the alkyl group may include methyl, ethyl, n-propyl, isopropyl, n-butyl, s-butyl, t-butyl, i-butyl, 2-ethylbutyl, 3,3-dimethylbutyl, n-pentyl, i-pentyl, neopentyl, t-pentyl, cyclopentyl, 1-methylpentyl, 3-methylpentyl, 2-ethylpentyl, 4-methyl-2-pentyl, n-hexyl, 1-methylhexyl, 2-ethylhexyl, 2-butylhexyl, cyclohexyl,
  • alkenyl group refers to a hydrocarbon group including one or more carbon-carbon double bonds in the middle and/or at the terminus of an alkyl group including 2 or more carbon atoms.
  • the alkenyl group may be a linear chain or a branched chain.
  • the number of carbons in the alkenyl group is not specifically limited, but may be 2 to 30, 2 to 20, or 2 to 10.
  • Non-limiting examples of the alkenyl group include a vinyl group, a 1-butenyl group, a 1-pentenyl group, a 1,3-butadienyl aryl group, a styrenyl group, a styryl vinyl group, etc.
  • alkynyl group refers to a hydrocarbon group including one or more carbon-carbon triple bonds in the middle or at the terminus of an alkyl group including more carbon atoms.
  • the alkynyl group may be a linear chain or a branched chain.
  • the number of carbons in the alkynyl group is not specifically limited, but may be 2 to 30, 2 to 20, or 2 to 10.
  • Non-limiting examples of the alkynyl group include an ethynyl group, a propynyl group, etc.
  • hydrocarbon ring group may refer to an optional functional group or substituent derived from an aliphatic hydrocarbon ring, or an optional functional group or substituent derived from an aromatic hydrocarbon ring.
  • the number of carbons in the hydrocarbon ring may be 5 to 60, 5 to 30, or 5 to 20.
  • aryl group refers to an optional functional group or substituent derived from an aromatic hydrocarbon ring.
  • the aryl group may be a monocyclic aryl group or a polycyclic aryl group.
  • the number of carbons in the ring of the aryl group may be 6 to 30, 6 to 20, or 6 to 15.
  • Non-limiting examples of the aryl group may include phenyl, naphthyl, fluorenyl, anthracenyl, phenanthryl, biphenyl, terphenyl, quaterphenyl, quinqphenyl, sexiphenyl, triphenylenyl, pyrenyl, benzofluoranthenyl, chrysenyl, etc.
  • heterocyclic group refers to an optional functional group or substituent derived from a ring including one or more heteroatoms selected from boron (B), oxygen (O), nitrogen (N), phosphorus (P), silicon (Si) and sulfur (S).
  • the heterocyclic group may be an aliphatic heterocyclic group or an aromatic heterocyclic group.
  • the aromatic heterocyclic group may be a heteroaryl group.
  • the aliphatic heterocycle and the aromatic heterocycle may each be a monocycle or polycycle.
  • the heterocyclic group may include one or more selected from B, O, N, P, Si and S as heteroatoms. If the heterocyclic group includes two or more heteroatoms, the two or more heteroatoms may be the same or different.
  • the heterocyclic group may be a monocyclic heterocyclic group or a polycyclic heterocyclic group, and in some embodiments may include a heteroaryl group.
  • the number of carbons in the ring of the heterocyclic group may be 2 to 30, 2 to 20, or 2 to 10.
  • the aliphatic heterocyclic group may include one or more selected from B, O, N, P, Si and S as heteroatoms.
  • the number of carbons in the ring of the aliphatic heterocyclic group may be 2 to 30, 2 to 20, or 2 to 10.
  • Non-limiting examples of the aliphatic heterocyclic group include an oxirane group, a thiirane group, a pyrrolidine group, a piperidine group, a tetrahydrofuran group, a tetrahydrothiophene group, a thiane group, a tetrahydropyrane group, a 1,4-dioxane group, etc.
  • the heteroaryl group may include one or more selected from B, O, N, P, Si and S as heteroatoms. If the heteroaryl group includes two or more heteroatoms, the two or more heteroatoms may be the same or different.
  • the heteroaryl group may be a monocyclic heterocyclic group or a polycyclic heterocyclic group. The number of carbons in the ring of the heteroaryl group may be 2 to 30, 2 to 20, or 2 to 10.
  • Non-limiting examples of the heteroaryl group include thiophene, furan, pyrrole, imidazole, triazole, pyridine, bipyridine, pyrimidine, triazine, triazole, acridyl, pyridazine, pyrazinyl, quinoline, quinazoline, quinoxaline, phenoxazine, phthalazine, pyrido pyrimidine, pyrido pyrazine, pyrazino pyrazine, isoquinoline, indole, carbazole, N-arylcarbazole, N-heteroarylcarbazole, N-alkylcarbazole, benzoxazole, benzimidazole, benzothiazole, benzocarbazole, benzothiophene, dibenzothiophene, thienothiophene, benzofuran, phenanthroline, thiazole, isooxazo
  • the arylene group may be similar to the aryl group except that the arylene group is a divalent group.
  • the heteroarylene group may be similar to the heteroaryl group except that the heteroarylene group is a divalent group.
  • silyl group refers to an alkyl silyl group or an aryl silyl group.
  • Non-limiting examples of the silyl group include a trimethylsilyl group, a triethylsilyl group, a t-butyldimethylsilyl group, a vinyldimethylsilyl group, a propyldimethylsilyl group, a triphenylsilyl group, a diphenylsilyl group, a phenylsilyl group, etc.
  • boryl group refers to an alkyl boryl group or an aryl boryl group.
  • Non-limiting examples of the boryl group include a trimethylboryl group, a triethylboryl group, a t-butyldimethylboryl group, a triphenylboryl group, a diphenylboryl group, a phenylboryl group, etc.
  • the carbon number of the amine group is not specifically limited, but may be 1 to 30.
  • the amine group may refer to an alkyl amine group, an aryl amine group, or a heteroaryl amine group.
  • Non-limiting examples of the amine group include a methylamine group, a dimethylamine group, a phenylamine group, a diphenylamine group, a naphthylamine group, a 9-methyl-anthracenylamine group, a triphenylamine group, etc.
  • oxy group may refer to an alkoxy group or an aryl oxy group.
  • the alkoxy group may include a linear, branched or cyclic alkyl chain.
  • the number of carbons in the alkoxy group is not specifically limited, but may be, for example, 1 to 20 or 1 to 10.
  • Non-limiting examples of the oxy group include methoxy, ethoxy, n-propoxy, isopropoxy, butoxy, pentyloxy, hexyloxy, octyloxy, nonyloxy, decyloxy, benzyloxy, etc.
  • alkyl group in the alkyl thio group, the alkyl sulfoxy group, the alkyl aryl group, the alkyl amino group, the alkyl boryl group and the alkyl silyl group is the same as described above, including the examples.
  • aryl group in the aryl oxy group, aryl thio group, aryl sulfoxy group, aryl amino group, aryl boron group, aryl silyl group, aryl selenium group, and aryl alkyl group is the same as described above, including the examples.
  • the emission layer EML of the organic electroluminescence device 10 of an embodiment includes a host having a first luminescent onset wavelength, a first dopant having a second luminescent onset wavelength, and a second dopant having a third luminescent onset wavelength.
  • the host may include a first host and a second host that is different from the first host.
  • the host may include a first host having a hole transport moiety and a second host having an electron transport moiety.
  • the host may be an exciplex formed by the first host and the second host.
  • the emission layer EML of an embodiment may include the first host including a carbazole group derivative moiety.
  • the first host may be represented by Formula H-1:
  • L 1 may be a direct linkage, a substituted or unsubstituted arylene group of 6 to 30 carbon atoms for forming a ring, or a substituted or unsubstituted heteroarylene group of 2 to 30 carbon atoms for forming a ring.
  • Ar 1 may be a substituted or unsubstituted aryl group of 6 to 30 carbon atoms for forming a ring, or a substituted or unsubstituted heteroaryl group of 2 to 30 carbon atoms for forming a ring.
  • “a” and “b” may be each independently an integer of 0 to 4, and R 1 and R 2 may be each independently a substituted or unsubstituted aryl group of 6 to 30 carbon atoms for forming a ring, or a substituted or unsubstituted heteroaryl group of 2 to 30 carbon atoms for forming a ring.
  • R 1 and R 2 may be each independently an integer of 2 or more, a plurality of R 1 groups and a plurality of R 2 groups may be the same or at least one thereof may be different.
  • “a” and “b” may be 0. In this case, the carbazole group is unsubstituted.
  • L 1 may be a direct linkage, a phenylene group, a divalent biphenyl group, a divalent carbazole group, etc., but an embodiment of the present disclosure is not limited thereto.
  • Ar 1 may be a substituted or unsubstituted carbazole group, a substituted or unsubstituted dibenzofuran group, a substituted or unsubstituted dibenzothiophene group, a substituted or unsubstituted biphenyl group, etc., but an embodiment of the present disclosure is not limited thereto.
  • the emission layer may include a compound represented by Formula H-2 as the second host:
  • Z 1 to Z 3 may each independently be CR y or N
  • R y and R 11 to R 13 may each independently be a hydrogen atom, a deuterium atom, a cyano group, a substituted or unsubstituted silyl group, a substituted or unsubstituted aryl group of 6 to 30 carbon atoms for forming a ring, or a substituted or unsubstituted heteroaryl group of 2 to 30 carbon atoms for forming a ring.
  • Formula H-2 may be represented by one of Formula H-2a or Formula H-2b:
  • R 11 to R 13 may each independently be a hydrogen atom, a deuterium atom, a cyano group, a substituted or unsubstituted silyl group, a substituted or unsubstituted aryl group of 6 to 30 carbon atoms for forming a ring, or a substituted or unsubstituted heteroaryl group of 2 to 30 carbon atoms for forming a ring.
  • R y1 to R y3 may each independently be a hydrogen atom, a deuterium atom, a cyano group, a substituted or unsubstituted silyl group, a substituted or unsubstituted aryl group of 6 to 30 carbon atoms for forming a ring, or a substituted or unsubstituted heteroaryl group of 2 to 30 carbon atoms for forming a ring.
  • At least one selected from R 11 to R 13 and R y1 to R y3 may be a cyano group, an aryl group of 6 to 30 carbon atoms for forming a ring including at least one cyano group as a substituent, or a heteroaryl group of 2 to 30 carbon atoms for forming a ring including at least one cyano group as a substituent.
  • the second host represented by Formula H-2a may include a triazine moiety
  • the second host represented by Formula H-2b may include at least one cyano group.
  • R 11 to R 13 may each independently be a substituted or unsubstituted phenyl group, a substituted or unsubstituted carbazole group, etc., but an embodiment of the present disclosure is not limited thereto.
  • any one selected from R 11 to R 13 and R y1 to R y3 may be substituted with a cyano group, or at least one selected from R 11 to R 13 and R y1 to R y3 may be a heteroaryl group of 2 to 30 carbon atoms for forming a ring substituted with a cyano group.
  • the heteroaryl group of 2 to 30 carbon atoms for forming a ring substituted with at least one cyano group may further include a substituent in addition to the cyano group, and the substituent may be a substituted or unsubstituted silyl group, a substituted or unsubstituted alkyl group of 1 to 10 carbon atoms, a substituted or unsubstituted aryl group of 6 to 30 carbon atoms for forming a ring, or a substituted or unsubstituted heteroaryl group of 2 to 30 carbon atoms for forming a ring.
  • the organic electroluminescence device 10 of an embodiment may include the first host represented by Formula H-1 and the second host represented by Formula H-2 simultaneously (e.g., at the same time) in the emission layer EML, and may also include a first dopant and a second dopant (described in more detail below), in the emission layer EML, and may show excellent emission efficiency and long-lifespan characteristics.
  • the host may be an exciplex formed by the first host represented by Formula H-1 and the second host represented by Formula H-2.
  • the first host may be a hole transport host
  • the second host may be an electron transport host.
  • the organic electroluminescence device 10 of an embodiment may include both (e.g., simultaneously) the first host having excellent hole transport properties and the second host having excellent electron transport properties in the emission layer EML, such that energy transfer to the dopant compounds may be efficient.
  • the emission layer EML may include an organometallic complex including iridium (Ir), ruthenium (Ru), rhodium (Rh), platinum (Pt), palladium (Pd), copper (Cu), or osmium (Os) as a central metal element, bonded to one or more ligands, as the first dopant.
  • the emission layer may include a compound represented by Formula D-1 as the first dopant:
  • M may be a metal element, such as a transition metal element.
  • M may be Pt, Pd, Cu, Os, Ir, Ru, or Rh.
  • Q 1 to Q 4 may each independently be C or N.
  • C1 to C4 may each independently be a substituted or unsubstituted hydrocarbon ring of 5 to 30 carbon atoms for forming a ring, or a substituted or unsubstituted heterocycle of 2 to 30 carbon atoms for forming a ring.
  • L 21 to L 23 may each independently be a direct linkage, *—O—*, *—S—*,
  • -* means a connected part with C1 to C4.
  • e1 to e3 may each independently be 0 or 1.
  • C1 and C2 may not be (are not) interconnected.
  • C2 and C3 may not be (are not) interconnected.
  • C3 and C4 may not be (are not) interconnected.
  • R 21 to R 26 may each independently be a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a substituted or unsubstituted amine group, a substituted or unsubstituted alkyl group of 1 to 20 carbon atoms, a substituted or unsubstituted aryl group of 6 to 30 carbon atoms for forming a ring, or a substituted or unsubstituted heteroaryl group of 1 to 30 carbon atoms for forming a ring, or may be combined with an adjacent group to form a ring.
  • R 21 to R 26 when R 21 to R 26 are alkyl groups, R 21 to R 26 may be a methyl group, an isopropyl group, or a tert-butyl group. When R 21 to R 26 are amine groups, R 21 to R 26 may be a dimethylamine group. When R 21 to R 26 are halogen atoms, R 21 to R 26 may be a fluorine atom (F).
  • d1 to d4 may each independently be an integer of 0 to 4.
  • d1 to d4 are each integers of 2 or more, a plurality of R 21 to R 24 groups may all be the same, or at least one may be different.
  • m may be 1 or 2.
  • M is Pt, Pd, Cu, or Os
  • m may be 1.
  • M is Ir, Ru, or Rh
  • m may be 1 or 2
  • e2 may be 0.
  • Formula D-1 may be represented by Formula D-1a-1:
  • C1 to C4, Q 1 to Q 4 , R 21 to R 24 , d1 to d4, L 22 , and e2 may be the same as described herein in connection with Formula D-1a.
  • C1 to C4 may each independently be a substituted or unsubstituted hydrocarbon ring or a substituted or unsubstituted heterocycle, represented by any one of C-1 to C-3:
  • P 1 may be C—* or CR 54
  • P 2 may be N—* or NR 61
  • P 3 may be N—* or NR 62 .
  • R 51 to R 64 may each independently be a substituted or unsubstituted alkyl group of 1 to 20 carbon atoms, a substituted or unsubstituted aryl group of 6 to 30 carbon atoms for forming a ring, or a substituted or unsubstituted heteroaryl group of 6 to 30 carbon atoms for forming a ring, or may be combined with an adjacent group to form a ring.
  • connection point with M1 the central metal atom
  • -* refers to a connection point with an adjacent ring group (C1 to C4) or a linker (L 21 to L 24 ).
  • Formula D-1 may be represented by Formula D-1b-1:
  • X 1 to X 4 , Y 1 to Y 4 , and Z 1 to Z 4 may each independently be CR n or N.
  • R p , R q , and R n may each independently be a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a substituted or unsubstituted alkyl group of 1 to 20 carbon atoms, a substituted or unsubstituted hydrocarbon ring of 5 to 30 carbon atoms for forming a ring, a substituted or unsubstituted heterocycle of 2 to 30 carbon atoms for forming a ring, or a substituted or unsubstituted amine group, or may be combined with an adjacent group to form a ring.
  • the hexagonal rings including X 1 to X 4 , Y 1 to Y 4 , or Z 1 to Z 4 as ring-forming atoms may each independently be a substituted or unsubstituted benzene ring, a substituted or unsubstituted pyridine ring, a substituted or unsubstituted pyrimidine ring, or a substituted or unsubstituted triazine ring.
  • the hexagonal rings including X 1 to X 4 , Y 1 to Y 4 , or Z 1 to Z 4 as ring-forming atoms may each independently be a substituted or unsubstituted benzene ring, a substituted or unsubstituted pyridine ring, a substituted or unsubstituted pyrimidine ring, or a substituted or unsubstituted triazine ring.
  • the first dopant represented by Formula D-1a or Formula D-1b may be a phosphorescent dopant.
  • the organic electroluminescence device 10 of an embodiment may include a second dopant in addition to the first dopant represented by Formula D-1 in the emission layer EML.
  • the second dopant may be a fluorescent dopant.
  • the second dopant may be a material to emit blue light.
  • the emission layer may include a compound represented by one of Formula D-2a or D-2b as the second dopant:
  • X 1 and X 2 may each independently be NR m or O, and R m may be a hydrogen atom, a deuterium atom, a substituted or unsubstituted alkyl group of 1 to 20 carbon atoms, a substituted or unsubstituted aryl group of 6 to 30 carbon atoms for forming a ring, or a substituted or unsubstituted heteroaryl group of 2 to 30 carbon atoms for forming a ring.
  • R 31 to R 41 may each independently be a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a substituted or unsubstituted amine group, a substituted or unsubstituted boryl group, a substituted or unsubstituted alkyl group of 1 to 20 carbon atoms, a substituted or unsubstituted aryl group of 6 to 30 carbon atoms for forming a ring, or a substituted or unsubstituted heteroaryl group of 2 to 30 carbon atoms for forming a ring, or may be combined with an adjacent group to form a ring.
  • R 31 to R 41 may each independently be a hydrogen atom, a substituted or unsubstituted phenyl group, a substituted or unsubstituted carbazole group, a substituted or unsubstituted aryl oxy group, a substituted or unsubstituted alkoxy group, a substituted or unsubstituted alkyl boryl group, or a substituted or unsubstituted aryl boryl group.
  • R 39 and R 40 may be combined with each other to form a heterocycle.
  • a condensed heterocycle formed by combining R 39 and R 40 with each other may include B, O, or N as a heteroatom.
  • the condensed heterocycle may be unsubstituted, or substituted with a substituted or unsubstituted aryl group or a substituted or unsubstituted heteroaryl group.
  • the second dopant represented by Formula D-2a may be represented by any one of Formula D-2a-1 to Formula D-2a-4:
  • R m1 to R m4 may each independently be a hydrogen atom, a deuterium atom, a substituted or unsubstituted alkyl group of 1 to 20 carbon atoms, a substituted or unsubstituted aryl group of 6 to 30 carbon atoms for forming a ring, or a substituted or unsubstituted heteroaryl group of 2 to 30 carbon atoms for forming a ring.
  • R 1 to R 18 may each independently be a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a substituted or unsubstituted amine group, a substituted or unsubstituted boryl group, a substituted or unsubstituted oxy group, a substituted or unsubstituted alkyl group of 1 to 20 carbon atoms, a substituted or unsubstituted aryl group of 6 to 30 carbon atoms for forming a ring, or a substituted or unsubstituted heteroaryl group of 2 to 30 carbon atoms for forming a ring, or combined with an adjacent group to form a ring.
  • R m1 to R m4 may each independently be a hydrogen atom or a substituted or unsubstituted phenyl group.
  • R 1 to R 18 may each independently be a hydrogen atom, an alkyl group of 1 to 10 carbon atoms, a substituted or unsubstituted phenyl group, a substituted or unsubstituted carbazole group, or a substituted or unsubstituted arylamine group of 6 to 20 carbon atoms for forming a ring.
  • an embodiment of the present disclosure is not limited thereto.
  • L2 may be a direct linkage, a substituted or unsubstituted arylene group of 6 to 30 carbon atoms for forming a ring, or a substituted or unsubstituted heteroarylene group of 2 to 30 carbon atoms for forming a ring.
  • L2 may be a direct linkage, or a substituted or unsubstituted phenylene group.
  • D 1 may be represented by one of Formula D-2-1 or Formula D-2-2:
  • L 3 and L 4 may each independently be a direct linkage, or a substituted or unsubstituted arylene group of 6 to 30 carbon atoms for forming a ring.
  • L 3 and L 4 may each independently be a direct linkage, or a substituted or unsubstituted phenylene group.
  • R 42 to R 59 may each independently be a hydrogen atom, a deuterium atom, a halogen atom, a substituted or unsubstituted amine group, a substituted or unsubstituted silyl group, a substituted or unsubstituted alkyl group of 1 to 15 carbon atoms, a substituted or unsubstituted aryl group of 6 to 30 carbon atoms for forming a ring, or a substituted or unsubstituted heteroaryl group of 2 to 30 carbon atoms for forming a ring.
  • R 42 to R 59 may be combined with an adjacent group to form a ring.
  • Y 1 may be a direct linkage, CR a R b , SiR c R d , GeR e R f , NR g , O, or S. In an embodiment, Y 1 may be a direct linkage, CR a R b , NR g , or O.
  • R a to R g may each independently be a substituted or unsubstituted alkyl group of 1 to 15 carbon atoms, a substituted or unsubstituted aryl group of 6 to 30 carbon atoms for forming a ring, or a substituted or unsubstituted heteroaryl group of 2 to 30 carbon atoms for forming a ring.
  • Each pair of R a and R b , R c and R d , and R e and R f may be combined with each other to form a ring.
  • a 1 may be represented by one of Formulae D-2-3 to D-2-10:
  • Y 2 may be C ⁇ O, or S(C ⁇ O) 2 .
  • Y 3 may be C ⁇ O, or O.
  • Y 4 and Y 5 may be each independently O, or S.
  • Y 6 and Y 7 may be each independently N, or CQ 12 .
  • Y 8 may be O or NQ 13 .
  • Q 1 to Q 13 may each independently be a substituted or unsubstituted alkyl group of 1 to 15 carbon atoms, a substituted or unsubstituted aryl group of 6 to 30 carbon atoms for forming a ring, or a substituted or unsubstituted heteroaryl group of 2 to 30 carbon atoms for forming a ring.
  • n1, n4, and n6 may each independently be 0 to 4; n3, n5, n7, n8, and n10 may each independently be an integer of 0 to 3; n2 may be an integer of 0 to 5; and n9 may be an integer of 0 to 2.
  • n1 to n10 are each independently an integer of 2 or more, a plurality of Q 1 to Q 10 may be the same, or at least one may be different.
  • the organic electroluminescence device 10 of an embodiment may include the first dopant represented by Formula D-1 and the second dopant represented by Formula D-2a or Formula D-2b in the emission layer EML.
  • the organic electroluminescence device 10 of an embodiment may include the first dopant and the second dopant simultaneously (e.g., together), and may show excellent emission efficiency and/or improved device lifespan characteristics.
  • the lowest triplet excitation energy level (T1 level) of the first dopant may be substantially equal to or greater than the lowest triplet excitation energy level (T1 level) of the second dopant.
  • the lowest triplet excitation energy level of the host may be substantially equal to or greater than the lowest triplet excitation energy level of the second dopant.
  • the first dopant may play the role of an assistant dopant which transfers the energy of the host to the second dopant.
  • the second dopant may be a light-emitting dopant that is excited by the transferred energy from the host via the first dopant, and subsequently emits light.
  • the lowest triplet excitation energy level of the host may be substantially equal to or greater than the lowest triplet excitation energy levels of the first dopant and the second dopant, respectively, and the lowest triplet excitation energy of the second dopant may be smaller than the lowest triplet excitation energy level of the host and the lowest triplet excitation energy level of the first dopant, respectively.
  • the second dopant may be a thermally activated delayed fluorescence (TADF) dopant.
  • TADF thermally activated delayed fluorescence
  • the second dopant may have a reverse intersystem crossing constant (k RISC ) of about 10 3 s ⁇ 1 or more and/or f (oscillation strength) of about 0.1 or more, and thus, thermally activated delayed fluorescence may be easily produced.
  • the second dopant is a light-emitting dopant to emit blue light
  • the emission layer EML may be to emit fluorescence.
  • the emission layer EML may emit blue light as delayed fluorescence.
  • the first dopant which is the assistant dopant, may accelerate the delayed fluorescence of the second dopant. Accordingly, the emission efficiency of the emission layer of an embodiment may be improved.
  • excitons formed in the emission layer EML may not be accumulated in the emission layer EML, but may rapidly emit light, thereby reducing device deterioration. Accordingly, the lifespan of the organic electroluminescence device 10 of an embodiment may increase.
  • the emission layer EML may include all the first host, the second host, the first dopant, and the second dopant, and the amount of the first dopant may be about 10 wt % to about 15 wt %, and the amount of the second dopant may be about 1 wt % to about 5 wt % based on the total weight of the first host, the second host, the first dopant, and the second dopant.
  • the first dopant may efficiently transfer energy to the second dopant, and thus, the emission efficiency and device lifespan may increase.
  • the amount of the first host and the second host may be the remainder of the total weight, e.g., excluding the first dopant and the second dopant.
  • the amount of the first host and the second host may be about 80 wt % to about 89 wt % based on the total weight of the first host, the second host, the first dopant, and the second dopant.
  • the weight ratio of the first host and the second host may be about 3:7 to about 7:3.
  • charge balance properties in the emission layer EML may be improved, and emission efficiency and/or device life may increase.
  • charge balance in the emission layer EML may be broken, emission efficiency may be degraded, and a device may be easily deteriorated.
  • the first host, the second host, the first dopant, and the second dopant included in the emission layer EML satisfy the above-described amounts and ratios, excellent emission efficiency and/or long life may be achieved.
  • the organic electroluminescence device 10 of an embodiment may include all of the first host, the second host, the first dopant, and the second dopant, and the emission layer EML may include the combination of two host materials and two dopant materials.
  • the emission layer EML may include two different hosts, a first dopant including an organometallic complex, and a second dopant emitting delayed fluorescence, and may thereby show excellent emission efficiency and/or lifespan characteristics.
  • the first host represented by Formula H-1 may be represented by any one of the compounds represented in Compound Group 1.
  • the emission layer EML may include at least one of the compounds represented in Compound Group 1 as the first host material.
  • the second host represented by Formula H-2 may be represented by any one of the compounds represented in Compound Group 2-1 and Compound Group 2-2.
  • the emission layer EML may include at least one of the compounds represented in Compound Group 2-1 and Compound Group 2-2 as the second host material.
  • Compound Group 2-1 may correspond to the second host material represented by Formula H-2a
  • Compound Group 2-2 may correspond to the second host material represented by Formula H-2b.
  • the emission layer EML may include at least one of the compounds represented in Compound Group 3-1 and Compound Group 3-2 as the first dopant material.
  • Compound Group 3-1 may correspond to the first dopant material represented by Formula D-1a
  • Compound Group 3-2 may correspond to the first dopant material represented by Formula D-1b.
  • each R may independently be a hydrogen atom, a methyl group, an isopropyl group, a tert-butyl group, or a dimethylamine group.
  • the second dopant represented by Formula D-2 may be represented by any one of the compounds represented in Compound Group 4-1 or
  • the emission layer EML may include at least one of the compounds represented in Compound Group 4-1 or Compound Group 4-2 as the second dopant material.
  • Compound Group 4-1 may correspond to the second dopant material represented by Formula D-2a
  • Compound Group 4-2 may correspond to the second dopant material represented by Formula D-2b.
  • the host has a first luminescent onset wavelength
  • the first dopant has a second luminescent onset wavelength
  • the second dopant has a third luminescent onset wavelength
  • the third luminescent onset wavelength of the second dopant is greater than each of the first luminescent onset wavelength and the second luminescent onset wavelength.
  • the third luminescent onset wavelength of the second dopant may be greater than the second luminescent onset wavelength of the first dopant, and the second luminescent onset wavelength of the first dopant may be greater than the first luminescent onset wavelength of the host.
  • the term “luminescent onset wavelength” is defined as the wavelength at an x-intercept value of a tangent line that is drawn at a position (e.g., on the left side of the peak) where the light intensity y-value is about 0.5 in the normalized light emission spectrum.
  • FIG. 6A to FIG. 6F are plots of the normalized light emission spectra (intensity vs. wavelength) of a host, a first dopant and a second dopant according to embodiments of the present disclosure.
  • the x-intercept value of the tangent line that is drawn at a position where light intensity is about 0.5 in the normalized light emission spectrum of the host may be defined as the first luminescent onset wavelength (x 1 ).
  • the x-intercept value of the tangent line that is drawn at a position where light intensity is about 0.5 in the normalized light emission spectrum of the first dopant may be defined as the second luminescent onset wavelength (x 2 ).
  • the x-intercept value of the tangent line that is drawn at a position where light intensity is about 0.5 in the normalized light emission spectrum of the second dopant may be defined as the third luminescent onset wavelength (x 3 ).
  • the third luminescent onset wavelength (x 3 ) of the second dopant has a greater value than each of the first luminescent onset wavelength (x 1 ) of the host and the second luminescent onset wavelength (x 2 ) of the first dopant according to an embodiment of the present disclosure.
  • the first luminescent onset wavelength (x 1 ) may be smaller than the second luminescent onset wavelength (x 2 ) and the third luminescent onset wavelength (x 3 ), and the second luminescent onset wavelength (x 2 ) may have a greater value than the first luminescent onset wavelength (x 1 ) and a smaller value than the third luminescent onset wavelength (x 3 ).
  • the values may increase in order of the first luminescent onset wavelength (x 1 ), the second luminescent onset wavelength (x 2 ), and the third luminescent onset wavelength (x 3 ).
  • the values may increase in order of the first luminescent onset wavelength (x 1 ), the second luminescent onset wavelength (x 2 ), and the third luminescent onset wavelength (x 3 ). Differently, as shown in FIG. 6A , when the light emission peak wavelength of the host is the smallest, the light emission peak wavelength of the first dopant is greater than the light emission peak wavelength of the host, and the light emission peak wavelength of the second dopant is the greatest, the values may increase in order of the first luminescent onset wavelength (x 1 ), the second luminescent onset wavelength (x 2 ), and the third luminescent onset wavelength (x 3 ). Differently, as shown in FIG.
  • the values when the light emission peak wavelength of the host is the smallest, and the light emission peak wavelength of the first dopant is the greatest, the values may also increase in order of the first luminescent onset wavelength (x 1 ), the second luminescent onset wavelength (x 2 ), and the third luminescent onset wavelength (x 3 ).
  • the values when the light emission peak wavelength of the host is greater than the light emission peak wavelength of the first dopant, and the light emission peak wavelength of the second dopant has the greatest value, the values may also increase in order of the first luminescent onset wavelength (x 1 ), the second luminescent onset wavelength (x 2 ), and the third luminescent onset wavelength (x 3 ). As shown in FIG.
  • the values may also increase in order of the first luminescent onset wavelength (x 1 ), the second luminescent onset wavelength (x 2 ), and the third luminescent onset wavelength (x 3 ).
  • the values may also increase in order of the first luminescent onset wavelength (x 1 ), the second luminescent onset wavelength (x 2 ), and the third luminescent onset wavelength (x 3 ).
  • the values may also increase in order of the first luminescent onset wavelength (x 1 ), the second luminescent onset wavelength (x 2 ), and the third luminescent onset wavelength (x 3 ). As shown in FIG.
  • the values may also increase in order of the first luminescent onset wavelength (x 1 ), the second luminescent onset wavelength (x 2 ), and the third luminescent onset wavelength (x 3 )
  • the first luminescent onset wavelength may be about 380 nm to about 430 nm
  • the second luminescent onset wavelength may be about 400 nm to about 450 nm
  • the third luminescent onset wavelength may be about 410 nm to about 460 nm.
  • the luminescent onset wavelength and luminescent onset energy are in inverse proportion to each other and may satisfy Equation 1:
  • the emission layer EML includes a host having the first luminescent onset wavelength, a first dopant having the second luminescent onset wavelength, and a second dopant having the third luminescent onset wavelength, and the third luminescent onset wavelength has a greater value than each of the first luminescent onset wavelength and the second luminescent onset wavelength.
  • the third luminescent onset wavelength is greater than the second luminescent onset wavelength, and the second luminescent onset wavelength may have a greater value than the first luminescent onset wavelength.
  • the luminescent onset wavelength of the second dopant (which is a light-emitting body) is the greatest
  • the luminescent onset wavelength of the first dopant (which plays the role of an assistant dopant) is smaller than the luminescent onset wavelength of the second dopant
  • the luminescent onset wavelength of the host has the smallest value. Accordingly, the energy transfer from the host to the first dopant, and from the first dopant to the second dopant may be easily achieved, and thus, the organic electroluminescence device may show excellent emission efficiency and/or lifespan characteristics.
  • FIG. 7A and FIG. 7B are plots of the light emission spectrum and light absorption spectrum (intensity vs. wavelength) of the second dopant according to an embodiment of the present disclosure.
  • the normalized light intensity at the cross point of the normalized light absorption spectrum and the normalized light emission spectrum of the second dopant may be about 0.5 or more.
  • the distance (n or n′) between the normalized light absorption spectrum peak and the normalized light emission spectrum peak of the second dopant may be about 50 nm or less.
  • the peak-to-peak distance n or n′ between the light absorption peak and the light emission peak in the normalized spectrum may be about 50 nm or less.
  • the organic electroluminescence device may show excellent emission efficiency and lifespan characteristics.
  • the organic electroluminescence device 10 of an embodiment may include a plurality of emission layers.
  • the plurality of emission layers may be provided by stacking in order.
  • an organic electroluminescence device 10 including a plurality of emission layers may be to emit white light.
  • the organic electroluminescence device including a plurality of emission layers may be an organic electroluminescence device of a tandem structure.
  • at least one emission layer EML may include all the first host, second host, first dopant, and second dopant, as described above.
  • an electron transport region ETR is provided on an emission layer EML.
  • the electron transport region ETR may include at least one of a hole blocking layer HBL, an electron transport layer ETL, or an electron injection layer EIL.
  • a hole blocking layer HBL hole blocking layer
  • ETL electron transport layer
  • EIL electron injection layer
  • the electron transport region ETR may have a single layer formed using a single material, a single layer formed using a plurality of different materials, or a multilayer structure having a plurality of layers formed using a plurality of different materials.
  • the electron transport region ETR may have a single layer structure including an electron injection layer EIL or an electron transport layer ETL, or a single layer structure formed using an electron injection material and an electron transport material (e.g., together). Further, the electron transport region ETR may have a plurality of layers formed of a plurality of different materials, for example, a structure stacked from the emission layer EML of electron transport layer ETL/electron injection layer EIL, or hole blocking layer HBL/electron transport layer ETL/electron injection layer EIL, without limitation.
  • the thickness of the electron transport region ETR may be, for example, about 1,000 ⁇ to about 1,500 ⁇ .
  • the electron transport region ETR may be formed using various suitable methods (such as a vacuum deposition method, a spin coating method, a cast method, a Langmuir-Blodgett (LB) method, an inkjet printing method, a laser printing method, and/or a laser induced thermal imaging (LITI) method).
  • suitable methods such as a vacuum deposition method, a spin coating method, a cast method, a Langmuir-Blodgett (LB) method, an inkjet printing method, a laser printing method, and/or a laser induced thermal imaging (LITI) method).
  • the electron transport region ETR may include an anthracene-based compound.
  • the electron transport region may include, for example, tris(8-hydroxyquinolinato)aluminum (Alq 3 ), 1,3,5-tri[(3-pyridyl)-phen-3-yl]benzene, 2,4,6-tris(3′-(pyridin-3-yl)biphenyl-3-yl)-1,3,5-triazine, 2-(4-(N-phenylbenzoimidazolyl-1-ylphenyl)-9,10-dinaphthylanthracene, 1,3,5-tri(1-phenyl-1H-benzo[d]imidazol-2-yl)benzene (TPBi), 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP), 4,7-diphenyl-1,10-phenanthroline (Bphen), 3-(4-
  • the thickness of the electron transport layer ETL may be about 100 ⁇ to about 1,000 ⁇ and may be, for example, about 150 ⁇ to about 500 ⁇ . If the thickness of the electron transport layer ETL satisfies the above-described range, satisfactory electron transport properties may be obtained without substantial increase of a driving voltage.
  • the electron transport region ETR may include a metal halide (such as LiF, NaCl, CsF, RbCl, RbI, and/or CuI), a lanthanide metal (such as ytterbium (Yb)), a metal oxide (such as Li 2 O and/or BaO), or lithium quinolate (LiQ).
  • a metal halide such as LiF, NaCl, CsF, RbCl, RbI, and/or CuI
  • a lanthanide metal such as ytterbium (Yb)
  • a metal oxide such as Li 2 O and/or BaO
  • LiQ lithium quinolate
  • the electron injection layer EIL may be formed using a mixture of an electron transport material and an insulating organo metal salt.
  • the organo metal salt may be a material having an energy band gap of about 4 eV or more.
  • the organo metal salt may include, for example, metal acetates, metal benzoates, metal acetoacetates, metal acetylacetonates, and/or metal stearates.
  • the thickness of the electron injection layer EIL may be about 1 ⁇ to about 100 ⁇ , or about 3 ⁇ to about 90 ⁇ . If the thickness of the electron injection layer EIL satisfies the above described range, satisfactory electron injection properties may be obtained without inducing substantial increase of a driving voltage.
  • the electron transport region ETR may include a hole blocking layer HBL as described above.
  • the hole blocking layer HBL may include, for example, at least one of 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP) or 4,7-diphenyl-1,10-phenanthroline (Bphen).
  • BCP 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline
  • Bphen 4,7-diphenyl-1,10-phenanthroline
  • an embodiment of the present disclosure is not limited thereto.
  • the second electrode EL 2 is provided on the electron transport region ETR.
  • the second electrode EL 2 may be a common electrode or a cathode.
  • the second electrode EL 2 may be a transmissive electrode, a transflective electrode or a reflective electrode. If the second electrode EL 2 is the transmissive electrode, the second electrode EL 2 may include a transparent metal oxide, for example, ITO, IZO, ZnO, ITZO, etc.
  • the second electrode EL 2 may include Ag, Mg, Cu, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr, Li, Ca, LiF/Ca, LiF/Al, Mo, Ti, a compound thereof, or a mixture thereof (for example, a mixture of Ag and Mg).
  • the second electrode EL 2 may have a multilayered structure including a reflective layer or a transflective layer formed using the above-described materials and a transparent conductive layer formed using ITO, IZO, ZnO, ITZO, etc.
  • the second electrode EL 2 may be connected with an auxiliary electrode. If the second electrode EL 2 is connected with the auxiliary electrode, the resistance of the second electrode EL 2 may decrease.
  • the organic electroluminescence device 10 of an embodiment may further include a buffer layer BFL between the emission layer EML and the electron transport region ETR.
  • the buffer layer BFL may control the concentration of excitons produced in the emission layer EML.
  • the buffer layer BFL may include a portion of the materials of the emission layer EML.
  • the buffer layer BFL may include the host material among the materials of the emission layer EML.
  • the lowest triplet excitation energy level of the material of the buffer layer BFL may be controlled or selected to be equal to or greater than the lowest triplet excitation energy level of the second dopant, and equal to or less than the lowest triplet excitation energy level of the second dopant according to the combination of the host and dopant materials included in the emission layer EML.
  • a capping layer CPL may be further disposed.
  • the capping layer CPL may include, for example, ⁇ -NPD, NPB, TPD, m-MTDATA, Alq 3 , CuPc, N4,N4,N4′,N4′-tetra(biphenyl-4-yl) biphenyl-4,4′-diamine (TPD15), 4,4′,4′′-tris(carbazol sol-9-yl) triphenylamine (TCTA), etc.
  • the compound of an embodiment may be included in a functional layer other than the emission layer EML as a material for an organic electroluminescence device 10 .
  • the organic electroluminescence device 10 may include the compound in at least one functional layer disposed between the first electrode EL 1 and the second electrode EL 2 , or in a capping layer CPL disposed on the second electrode EL 2 .
  • the organic electroluminescence device 10 includes (e.g., optimizes) the combination of the host material and the dopant material of the emission layer EML as described above, and may show excellent emission efficiency and/or long-lifespan characteristics.
  • the organic electroluminescence device 10 of an embodiment may show high efficiency and long-lifespan characteristics in a blue wavelength region.
  • Examples were manufactured as follows. An ITO glass substrate was cut into a size of 50 mm ⁇ 50 mm ⁇ 0.5 mm, washed by ultrasonic waves using isopropyl alcohol and distilled water for 10 minutes each, exposed to ultraviolet rays and ozone for about 10 minutes for washing, and installed in a vacuum deposition apparatus. Then, a hole injection layer HIL was formed at a thickness of about 40 ⁇ using 2-MTDATA, and a hole transport layer HTL was formed at a thickness of about 10 ⁇ using NPB.
  • the first host, the second host, the first dopant, and the second dopant according to embodiments were co-deposited to form an emission layer EML into a thickness of about 200 ⁇ , and an electron transport layer ETL was formed using a compound ETL1 (shown below) at a thickness of about 300 ⁇ . Then, a second electrode was formed using Al at a thickness of about 1,200 ⁇ . All layers were formed by a vacuum deposition method.
  • Example 1 HT-01 ET1-2 AD1-2 D-02
  • Example 2 HT-01 ET1-6 AD1-15 DA-03
  • Example 3 HT-03 ET1-8 AD2-21 DA-05
  • Example 4 HT-04 ET1-11 AD1-20 DA-07
  • Example 5 HT-08 ET1-14 AD2-27 DA-17
  • Example 6 HT-10 ET1-15 AD1-31 D-05
  • Example 7 HT-11 ET2-1 AD2-49 D-11
  • Example 8 HT-13 ET2-3 AD2-55 D-19
  • Example 9 HT-15 ET2-7 AD2-80 DA-27
  • Example 10 HT-17 ET2-11 AD1-33 D-20 Comparative HT-02 — AD1-2 DA-04
  • Example 1 Comparative HT-05 ET1-4 — DA-11
  • Example 2 Comparative HT-08 ET1-10 AD2-22 D-19
  • Example 3 Comparative HT-10 — AD1-23 —
  • Example 4 Comparative HT-10 — AD1-23 —
  • Example 4 Comparative HT-10 — AD1-23 — Example
  • the evaluation of the properties of the organic electroluminescence devices was conducted using a brightness light distribution characteristics measurement system.
  • driving voltage, luminance, efficiency, emission wavelength, and lifespan (T 95 ) were measured.
  • Emission efficiencies (cd/A) for the organic electroluminescence devices thus manufactured were measured at a current density of about 10 mA/cm 2 and a luminance of about 1,000 cd/m 2 .
  • the device lifespan (T 95 ) is the time period after which the luminance decreases to 95% from a standard (e.g., initial luminance) of about 1,000 cd/m 2 .
  • the device life (T 95 ) was measured by continuously (e.g., substantially continuously) driving at a current density of about 10 mA/cm 2 , and the results are shown in terms of hours.
  • the emission layer according to an embodiment includes all the first host, the second host, the first dopant and the second dopant, and the luminescent onset wavelength of the second dopant has a greater value than the luminescent onset wavelength of the first dopant.
  • Comparative Examples 1, 2, and 4 to 10 one of the first host, the second host, the first dopant and the second dopant was not included, and at least one among efficiency and life was therefore decreased when compared with the devices of the Examples.
  • Comparative Examples 3 and 11 to 17 each included all of the first host, the second host, the first dopant, and the second dopant, and the second dopant had a greater luminescent onset wavelength value than each of the first dopant and the host, Comparative Examples 3 and 11 to 17 showed decreased emission efficiency and device life when compared with the light-emitting devices of the Examples.
  • Comparative Examples 18 to 20 included all the first host, the second host, the first dopant, and the second dopant, and the first dopant and the host each had a smaller luminescent onset wavelength than the second dopant, the normalized light intensity at a wavelength cross point was less than about 1.5 and at the same time, the distance between light absorption/emission peaks was greater than about 50 nm. Accordingly, the emission efficiency and device life were decreased when compared with the light-emitting devices of the Examples.
  • the second dopant (which is a light-emitting body) has the greatest luminescent onset wavelength
  • the first dopant (which performs the function of an assistant dopant) has a smaller luminescent onset wavelength than the second dopant
  • the host has the smallest luminescent onset wavelength. Accordingly, energy transfer between the materials in the emission layer may be improved, and high emission efficiency and/or long-lifespan characteristics may be achieved.
  • the organic electroluminescence device of an embodiment has a normalized light intensity of about 0.5 or more at the wavelength cross point of the normalized light absorption spectrum and normalized light emission spectrum of the second dopant (which is a light-emitting body), and energy transfer from the host and the first dopant to the second dopant may be improved, and high emission efficiency and/or long-lifespan characteristics may be shown.
  • the organic electroluminescence device of an embodiment may show improved device properties of long lifespan and/or high efficiency.
  • the organic electroluminescence device of an embodiment includes two host materials and two dopant materials, and may show high efficiency and long-lifespan characteristics.

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